Buck switching power supply and boost switching power supply are named according to their conversion methods. The main difference between them lies in the conversion methods of input voltage and output voltage and the different application scenarios. Specifically, their differences are mainly reflected in the following aspects:

Voltage conversion direction: Buck switching power supply reduces the input voltage to output voltage, while boost switching power supply reduces the input voltage to output voltage. goes high to the output voltage.

Circuit structure: The circuit structure of the buck switching power supply is different from that of the boost switching power supply. Step-down switching power supply usually uses a step-down circuit, which is composed of switching elements and transformers. The boost switching power supply uses a boost circuit, which is composed of switching elements, inductors, capacitors and other components.

Applicable occasions: Step-down switching power supply is often used in electronic equipment, LED lighting and other occasions, because these equipment usually require low-voltage DC power supply to work. Boost switching power supplies are often used in solar panels, gas discharge lamps, etc., because these devices require high-voltage DC power to work.

Efficiency and cost: Buck switching power supplies have higher conversion efficiency than boost switching power supplies. However, the component cost of a buck switching power supply is relatively high because a larger inductor component is required to reduce the power supply ripple voltage. The boost switching power supply is relatively low-cost, but has low conversion efficiency.

In summary, the difference between a buck switching power supply and a boost switching power supply is mainly based on the conversion method of the input voltage and output voltage and the application occasions. Therefore, when selecting and using a switching power supply, the most appropriate type should be selected according to the specific application and requirements.